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<h1 class="topictitle1">Backup or Restoration of a VM That Contains RDM Disks Fails</h1>
<div><div class="section"><h4 class="sectiontitle">Symptom</h4><p>Backup or restoration of a VM that contains RDM disks fails. A message is displayed, indicating the failure of restoring VM disks or the failure of instructing client (<em>xxx</em>) to complete backup of disk (<em>xxx</em>).</p>
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<div class="section"><h4 class="sectiontitle">Possible Causes</h4><p>Jobs that involve RDM disks contain disk scanning. Due to insufficient resources of the current client, disk scanning may time out. As a result, the backup or restoration job fails.</p>
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<div class="section"><h4 class="sectiontitle">Troubleshooting</h4><ol><li><span>Log in to the host where the client is installed as user <strong>root</strong>.</span></li><li><span>Run the following command to restart the iSCSI service:</span><p><pre class="screen">systemctl restart iscsi.service</pre>
</p></li><li><span>Run the following command to reboot the host where the client is installed:</span><p><pre class="screen">reboot </pre>
<p>If the environment is not restored:</p>
<ul><li>Check whether the specifications of the host where the client is installed meet the requirements in the product documentation.</li><li>Check whether the OS of the host where the client is installed is in the compatibility list.</li><li>Check whether Huawei UltraPath is installed on the host where the client is installed. If the built-in multipathing software of the system is used, disk scanning will time out.</li></ul>
<p>If the fault persists, you are advised to use another host where the client is installed to perform the backup or restoration job.</p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0000002200054965.html">FAQs</a></div>
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